package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> entities = baseMapper.selectList(null);

        List<CategoryEntity> level1Menu = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map((menu) -> {
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2) -> {
            return ((menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort()));
        }).collect(Collectors.toList());


        return level1Menu;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {

        List<Long> parentPath = findParentPath1(catelogId);

        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }

    @Override
    public void updateDetail(CategoryEntity category) {
        this.updateById(category);

        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());

    }

    private List<Long> findParentPath(Long catelogId,List<Long> path){
        path.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if ( byId.getParentCid() != 0){
            findParentPath(byId.getParentCid(),path);
        }
        return path;
    }

    private List<Long> findParentPath1(Long catelogId){
        List<Long> res = new ArrayList<>();
        while (catelogId != 0){
            res.add(catelogId);
            CategoryEntity catelog = this.getById(catelogId);
            catelogId = catelog.getParentCid();
        }

        return res;
    }

    public List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> collect = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map((categoryEntity) -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return ((menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort()));
        }).collect(Collectors.toList());

        return collect;
    }


}